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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9b131e0ab19d711e4f8cd4dc77245e55efa76a2138b6cf5c3e7bba392c5ff37' 
  AND token = 'DlB7rQ1tKGTyNPB7RbhO24PutNIlIQFB820Mzr++qsk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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