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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e13b512a98678bd1510ea04894d7bcbf3efde1cc882730e19b34c43b480073b8' 
  AND token = 'x96U5VxSE4JLWY4rOFeGWv2aDx4Q6Ymg8i42fUrbU5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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