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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b1a3171f3b605f3727d34bc1c411bb1d9c738aebfbfd613aaaa33615b6c1d40' 
  AND token = 'Pie1r5/HrmYzZM/s6ziAsPE0He04qV9OoRpQI/R48ek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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