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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb29a59e63eaf3c1537dc92bdbb102b42fa94e0f32047c2aa2c1beed43b6ce27' 
  AND token = '4SiEnXUtET67g3tIQ9/WZ3IGo51y761mst5pRVDh1tk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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