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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e631132ad88f03bb523292fbee5345505f933e82ea43f9828eaf69328f1ee349' 
  AND token = 'teeUY+dpq50pGGUvxTw8Hcts8qKHMFef1LZRHLn5pUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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