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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbf83df54a3e17277d992b8d42dd07b6ad8163699219bc9051956ffa28df9bcf' 
  AND token = 'ItF+BkkEqbn7D6F0XbSqqQq0hLLURj8NcCRZlFU2TTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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