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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '472f667449813867e4de8412183cac5e356f028e02b818a150df05ee1d6bca12' 
  AND token = 'yxmxofQZhlLbfTOHAuHSHo0TCxXV/lqjHxnKuHMub1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00074

JSON explain

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