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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c2253d373b9a8f52915a3109df503dc6b54a44792e00f7a7cd153ad954f28ba' 
  AND token = 'LnOzW+aJ7EoXu9tB0dVtjc17ZcMv907fbf8wvD6du6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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