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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ab5e2adc9ba001be0834d92351a6eb9d362e6627386b2027c8e6feae561bb32' 
  AND token = 'tQUsTqaA3ZZ67BieRS7FRysRpQhOSscqJ5hWyKNBk7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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