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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '739a504982f39bd7b156b1651dec40b7101fc1857bfab2ecb769150704768681' 
  AND token = 'Pu/aQl5yDquqvT41ciQGHbj3PhUTM2LceI3acrNE1eo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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