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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a61309a53922a18d1ae703464736928ba1a709903d817a31578dba3d3eb8369b' 
  AND token = 'yI9OhVXg7/GR/KbsxuuFVexCAYKdC4l5cebaJIZd6T4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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