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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5e761ff0d5325c2d8042c9204346ae4e63ba3d6774ff75a8b4388fa8d5a8040' 
  AND token = '5kQk621hBpUXsgBZm4TOKBa2GkA11/Vu+8+RUlk0iOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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