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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec8b0a0776f5b58a045b44b4830f42a2106820b9f3a352e48082287a6531e0cf' 
  AND token = 'oRCW0AYRCvrxFtg5YchkedO/ms+GMGnHALrHE9YLK/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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