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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '834e1665609746f923e5b0eb7f49439b9855cd6ad1cc70fad8e501d2e1a70741' 
  AND token = 'VDHq1FOyJLqKojiBbZVqXE/DfAd6zWfrobf1H+3q100=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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