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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '934b28fa70ed33bef8793b36af557a14d6531bec610ceac31f828213ad661dae' 
  AND token = 'fdUdZYQP0H8J0Wqqc8Nd1FmdPqpmxnlFlJQkHZfkzCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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