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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3b9f658c908c3fa2cd80061312bb00acbda212ec7777c70192362c470581281' 
  AND token = 'lNs0YdN6R6jTShpg3s7yfY9lOxDqzFHWb+tkUll2O64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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