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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e09ed3c6b29520fecd0d8568a8d9245517f227ad55938bceb5ffa08de878058' 
  AND token = 'IZCU4khQPxbMV/K8CMdM4Lrpbc6/CdrCz4qlgVGJ0O8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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