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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5eda747e36582ca846016e0f49b9eadf8f01ae9bb280345c55a4d5a0bc98aee0' 
  AND token = 'AnebppmjmbD175kLh6YacQ95rFwcC7uJV9qE/baiIsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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