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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48832edcbc03bae19a78893bc32f75bdbfb8455c444069b3643d601c2a319e40' 
  AND token = 'K+CvUjK1RE/FFIaa2dx9XgM6jp0L5hvXnRtEl/eYE/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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