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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2022c34e6e1e7f8eecbfc7a4df9982ff1cc2bd3d8aa71912d097261aa1f70733' 
  AND token = 'Gqr+tPwouc6wNuoM023EcgyhKDEuJsLJxoyy/+Gk9Lo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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