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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '914fe452d4a9c5618306134d7803691a9632eb4c4cfb8e77c1db991e55f06efe' 
  AND token = '2FeUq8fnSbJZhfp89xMb/kan+h+wN4tOKBy8ugRpP3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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