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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59069bface81d2ccbe604616c6111c01374dba4eb9e86d7affce952d5bd32cc4' 
  AND token = 'Cf5mUqlwWhsPSqly1+PweWkzPKyEX6NYWfxt8Q3ZF+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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