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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be8206a96d49797aa2f82388a1c234d7794b9952e8e1aa700800f9c3b525721a' 
  AND token = 'AQmujkOMP8oADs2zg+jRHNSK5LpaVeFkmh/QwDTV2Fc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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