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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c2a2e70128029b4a08c356cddb5ff47e5ba5d605488229ed5ceb44e795047f0' 
  AND token = 'k+FwT5htPl8zY/JE5kjyifEszsOe6QnltF17o4XxoEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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