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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea431ce8c7df6bd5f8372ead388d55ef8d57692a4ecd53693c575072688ca051' 
  AND token = 'YLfTYBoastZbSHHZF1LusJkx7mpHodwG0CnEoI3K3LE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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