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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84fe3939609ae6d4ef8b7886cf4c471e4571bad05c648ef80bd1219ea4787d3c' 
  AND token = '7klDMLT2IPv1/SnQVr/zmEAxbQkS95ZTtSXM2B8Pt2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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