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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be7704f46d0194a28820ed45d2533adc544122996701381131725642d4711f3c' 
  AND token = 'vuIOEvtOEC727HQXiq6aQcle2B8xtcE/Yhe/B498YOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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