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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '194ac806a1d86559244f9bc9bece324738e086524cd366ec30eff143395606c9' 
  AND token = 'uOyWh0cquHfVsk/G8mfNBSrZVBgRNCsjZI76t811Lzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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