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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a4c90ae85c30baf7b8bb091057e16be6f95d423e1ede2976946ac7a2a616192' 
  AND token = '3G5WoKuxSophw/L7eQfyVGS37qB8HLD8MP+Rh52KA94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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