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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a7b7386b8b7fa6d330ee687208708c629125fb9f0d83f0115973faced6c84d5' 
  AND token = 'LYfzU3+aeVXtbiY7P+ozgVKis+656xPHk6lxzf9cmGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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