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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d62a6816a46ae92f7f759093450b06c16c44ef67c804ab84e3deed5b201ba4d' 
  AND token = 'nzBm+T6DibWx+246JPtUsRS/Y+kwVF7CApp3AOw35JQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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