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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b67bc2cb3fad63fb07d238071c1f4d0c7eb24127787d27057c48589395358b6a' 
  AND token = 'ql3pdQFoAi2yKTdvh5n/OGz7QQTgeEIV3+tqbPrCfqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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