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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76b30dad4f6f7a5a62b5c0e7cfb7591626567d2f1dd2c895d1e10e18a1408181' 
  AND token = 'Jq7e/ozcfG2XOVKLv5ZoCRhifhuzTiJ3ciEVdbW57wo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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