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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a8189b4eb1cc6efbe6e2271e5777c73c4c9fd694d0098ff4c7592da5088c001' 
  AND token = 'GJvyIYKx3z7RLpUgcGER0fzzXRyz/1bOIfEfHyESajU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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