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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9634de5609b0722f05e20850ca8cb065ef0ff306578338cf1c9b640d045b331' 
  AND token = 'se/Ytukl4b/HqLL9ozRMFHkisXPN9blRIEiOwEgxM1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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