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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d0e3713a3035308b0f2d6ea3f820f5d2646bad6dda785b9e3f94f3b1c05e522' 
  AND token = 'J1LaZXrvYfZTuYI3RemrE1/vWzyaf67EpN+itt+vkas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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