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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dff3adb78edfb99cbb1eb8c0c71b07bcbcd077fa5b6bd203783cd3093e79c22' 
  AND token = 'U9R8G+RPyhluncCsQmewSL4jUJJ5hJS0//stb5N4o9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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