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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56c0b2e26493748f6d2237f0ef897015c61b6bc61cbede465044c9e04cc62cc8' 
  AND token = 'rjtXP/iSwmA41yRiFu7PaJGk8d+vkCjcACyHwWQ57Oo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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