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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42faf4cace6cad1010e14a9c8b53a419c3a7f4c13fdfe06bfb6d7e11de3e444e' 
  AND token = 'q3oU4p8UFrrF8f0deVgNNxyGvf0F94vQsgYpTHYQK8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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