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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '124edfe470734d87be58d73127fbb9ae4a952e5042b8716f51f53c4dd49c834b' 
  AND token = 'egIq9eHpEFg5pGiEGv6Mt34PGECMAromEaIerz2euUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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