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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5674bc458431516682ab2a27ceb01035f4a1092e1a2205e3be3c97c835d7461' 
  AND token = 'X5Wq/NKgjfzcMagFahSsYQODleLT9kK/75CjOQcf0A4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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