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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90eebb15b838b5708d7c65059c751399e139e2938b2ad44db9bee2b7d2666557' 
  AND token = 'bksIVaM9W5SeZaGPpGWnSYjLzvYIR/hzSJoQeSdyCi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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