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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f96b155413a602642ce73e43030b222e32a3b4103e8bd7edc46f84167936d19' 
  AND token = 'dRoAOvPxRo9M9S7r860Dj1R9tDVZLuQYIJJ8qSb6Iyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00078

JSON explain

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