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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1afa5ae2f095f489ec28fc737cecb5f7a531b2360e6d536caaa93bf9ba958785' 
  AND token = 'sGtw6ZvpP8MMeSDqtUb45zu8fN2AktpLR6zE7PM9hnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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