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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c41579bd6108dab7ed04dcee84e3ef9242f6704085259c76ccefc67d89b67b4e' 
  AND token = 'm1CTNLPVJr3mDxqYWvHKJTBUA796qyv6oYDvDuCossA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00085

JSON explain

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