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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e96f52f3cc798455d111fa58e8e651c85583af2bfe1ee0274fc9b05943f7f710' 
  AND token = 'SbrFYt1e0mu7H4VdIf5o0vJe/iQsnH1tMerql26KygU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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