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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbb97e3b57b2b81be15751670f50e2012b156c0eff7c4b3fb6ddfc60ec3fd011' 
  AND token = 'kLED6sEGn8PeUopXtA2+Oy10LwJL5bizKsOew/s7XKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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