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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab304535415fa8bfa622ea12f4ed46d4b9e70b0014c49a3dbd8111f826905801' 
  AND token = 'EPRQ6Aka9wBkYZ1MiH7Tj6hEg5CAbkGYtex9ci1o9bc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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