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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81c7b653db6731d9548f109d4dce9f5a62de8c37f701ffc38ba296045d611bcf' 
  AND token = '89t75TdcqkkQjmB3ADdCR8lynw/kSQk4TtFFyVERmhA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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