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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10dc0efd8caa5bebbc8683f33c62d83fab0f2d9fe43119113cd1a44264e5c3d7' 
  AND token = 'nHGTPTI0NOnp2K7ZsMWXaZPIaMZiQNwO4pXFuL1tNCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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