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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e092a02c28b2f7737d44d1db3bcbc07f28b4ec8f786a02854d44765f30a0e41' 
  AND token = '6xEzj9bgLpGO/F3qAARf+a2nnS43ba/oiikvz/M0/70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}