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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efbcc4ff62fad318b724bf951fb5fe6f9aaa05605df2619c7223dfb38a3def52' 
  AND token = 'rbyaaGa3qtsi+n0BhamLP+29C57i7eexbWv0neXOu90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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