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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ca0e65857bf34b75be6df6f5f35675cfe3537c4973ff41beb6fbc4f19aeac28' 
  AND token = 'rMiXchJJ+20W26UZhKGA4NRiAj7PIwPYdY9w+YDbgsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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