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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b77533312e6a1b7f070f1c9761942fdeb4a178cbe13ff3794c469914bd6291b9' 
  AND token = '610duExfGrSUwKWgoGIuSS/leiwyhv4Yeb8iTP4qEp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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