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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90fdaf7c5e6d0ddcd06116a9c1fc394cdc96f6fb280e499d83349b193059c934' 
  AND token = 'RSOWs6jgVYUQn1g6yLxeabAgQoipMpUMVUgME1GmZ8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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