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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9e2b1692a58ac46d744c0eac1c7f056de6665b8a9230529f1356e56d24f465b' 
  AND token = 'uD3a22UC5ai2Z77DMXpJwTGYATp7bN1Fz5wrHQ8UG+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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