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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf047a1f07fa8960d1d0a775be618bfe5a69d4802c8fbdfbdc3676e8b5494424' 
  AND token = '3eMUkmCrW6kr2oofdlI1yQk0pXFGLJ3xLvOxribQokg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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