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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1abc02ad451f7b6c95ea2539a8f02e437d09e1b7646f1a9fb4f8ca6b25f88680' 
  AND token = 'VWWda1Ax5nYyLUgbBbhzaYrvIECQ312zb8nt2kF81ek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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