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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74867c1cb28eee4fde46cbc482dc65db206ac849dcc207dff36d94e3bd718e86' 
  AND token = 'dAaO7klpUdu6xnfA5rXVKMZ27r40Skyijp28cmSkPl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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