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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82ab87df030162cdf5507a8fcc255c089ffdbf32b655b259a84e5cc7fcb22a5f' 
  AND token = 'Qx4FO9kbkjvjb9tSAVsiUKyv/57sROQbXoKX0lFPugU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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