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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd0feb2a96d670aed2ae0206e2fca73904c7b11c5030262ec1c138a0d7834b60' 
  AND token = 'W6tWlvpzJ7QMKIe7WY9qbfhzuT2tgBF1TMdDeBcnL1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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