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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc66edd544bcc0804b9b3d4d2fd63f0bdd7e90a9cbd1f998719cf644783b746f' 
  AND token = 'Iadd1MhfPmXDOfMCslNPrWJQR00B7gnwJYnr0nKByjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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