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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91d7883652ba261c9329bc2d3648b0f6d1b071bf75cd5bd6cdac1001acda8bda' 
  AND token = 'Cn0318Btd7MetiQYNm40/NK2pf9E1tB3keEGXiM5//A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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