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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '068bef9432cc73f05f4a302d75761361697eac7b1a2c4db16b5962efd6700680' 
  AND token = '6l3LYVjj5g8igJssrFjR3XhJnwc/xRanhHtdDtSrXRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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